Pipe end groove cutting device

Abstract

The invention relates to the technical field of metal pipe welding, in particular to a pipe end groove cutting device, and aims to solve the problems of inconsistent groove size and angle deflection caused by the fact that the diameter of a rotary table is large and the consistency of the distance between a cutting point and the surface of a pipe body cannot be maintained in the prior art. The pipe end groove cutting device comprises a rotating mechanism and a walking cutting mechanism. The rotating mechanism drives the steel pipe to rotate around the axis. The walking cutting mechanism comprises a cutting assembly, and the cutting assembly comprises a deflection unit, a guide wheel unit installed on the deflection unit and a groove cutting unit. According to the pipe end groove cutting device, the consistency of the distance between a cutting point and the surface of a pipe body is effectively controlled through abutting of the guide wheel unit and a steel pipe and cooperation of the guide wheel unit and the groove cutting unit. The problems that according to an existing large-diameter spiral seam submerged arc welded pipe end groove machining technology, the diameter of a rotary disc is large, and the distance between a cutting point and the surface of a pipe body cannot be kept consistent, so that the groove size is inconsistent, and the angle is deflected are solved.

Description

Technical Field

[0001] This invention relates to the field of metal pipe welding technology, and in particular to a pipe end beveling cutting device. Background Technology

[0002] In the manufacturing process of large-diameter spiral submerged arc welded pipes, there are two main pipe end beveling solutions to address the challenges of pipe end beveling. One solution uses a large beveling machine. However, due to the large diameter of the turntable, processing accuracy decreases, resulting in inconsistent beveling dimensions and angle deviations during processing, affecting the welding quality and construction progress between steel pipes on site. The other solution uses an online spiral welded pipe cutting system. This system uses lasers and sensors for non-contact cutting, improving cutting accuracy. However, because it cannot maintain a consistent distance between the cutting point and the pipe surface, it can cause uneven beveling dimensions when processing non-circular pipes.

[0003] The existing technology for beveling the ends of large-diameter spiral submerged arc welded pipes suffers from inconsistent beveling dimensions and skewed angles due to the large diameter of the turntable and the inability to maintain a consistent distance between the cutting point and the pipe surface. Summary of the Invention

[0004] The purpose of this invention is to provide a pipe end beveling cutting device to solve the problems of inconsistent beveling dimensions and angle deviation caused by the large diameter of the turntable and the inability to maintain the consistency of the distance between the cutting point and the pipe surface in related technologies.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0006] The pipe end beveling cutting device provided by the present invention includes:

[0007] A rotating mechanism and a traveling cutting mechanism are included. The rotating mechanism drives the steel pipe to rotate around its own axis. The traveling cutting mechanism includes a cutting assembly, which comprises a tilting unit, a guide wheel unit mounted on the tilting unit, and a bevel cutting unit. The tilting unit drives the guide wheel unit to abut against the outer circumference of the steel pipe, and the bevel cutting unit cuts the steel pipe at a preset tilt angle. The relative installation positions of the guide wheel unit and the bevel cutting unit control the cutting depth of the bevel.

[0008] Specifically, the walking cutting mechanism further includes a walking assembly, which comprises a sliding frame and a slide rail. The sway unit is mounted on the sliding frame, and the sliding frame is slidably connected to the slide rail along the axial direction of the steel pipe.

[0009] Specifically, the sliding frame includes a vehicle body and V-shaped wheels. The slide rail includes a guide rail base and a V-shaped guide rail. The V-shaped wheels are rotatably connected to the vehicle body, and the V-shaped guide rail is mounted on the guide rail base. The V-shaped wheels roll on the V-shaped guide rail.

[0010] Specifically, the sliding frame further includes flat wheels, which are rotatably connected to the vehicle body. The slide rail also includes a flat guide rail, which is mounted on the guide rail base. The flat wheels roll on the flat guide rail.

[0011] Specifically, the walking assembly further includes a power unit, which comprises a motor, a gear, and a rack. The motor is mounted on the vehicle body, the rack is mounted on the guide rail base, and the gear is mounted on the motor and meshes with the rack.

[0012] Specifically, the oscillation unit includes a fixed base, a connecting frame, and a first magnetic powder brake. The fixed base is mounted on the sliding frame, and the connecting frame is hinged to the fixed base via the first magnetic powder brake. The guide wheel unit and the bevel cutting unit are mounted on the connecting frame.

[0013] Specifically, the sliding frame has multiple support surfaces at different heights. The support surfaces are arranged in a stepped manner, with one of the support surfaces serving as a fixed surface. The fixing seat is mounted on the fixed surface.

[0014] Specifically, the guide wheel unit includes a cutter wheel, a first connecting rod, and a second magnetic powder brake. One end of the first connecting rod is hinged to the connecting frame via the second magnetic powder brake, and the other end is rotatably connected to the cutter wheel.

[0015] Specifically, the beveling unit includes a plasma cutting gun, a rotating base, and a second connecting rod. The plasma cutting gun is mounted on the rotating base. The rotating base is hinged to the second connecting rod. The second connecting rod is hinged to the connecting frame. The hinge axis of the rotating base and the second connecting rod is perpendicular to the hinge axis of the second connecting rod and the connecting frame.

[0016] Specifically, the rotating mechanism includes a base and two rotating rollers rotatably connected to the base. The steel pipe abuts against the rotating rollers. The rotation of the rotating rollers drives the steel pipe to rotate.

[0017] Based on the above technical solutions, the beneficial effects of the present invention are analyzed as follows:

[0018] This invention provides a pipe end beveling cutting device, comprising:

[0019] A rotating mechanism and a traveling cutting mechanism are included. The rotating mechanism drives the steel pipe to rotate around its own axis. The traveling cutting mechanism includes a cutting assembly, which comprises a tilting unit, a guide wheel unit mounted on the tilting unit, and a bevel cutting unit. The tilting unit drives the guide wheel unit to abut against the outer circumference of the steel pipe, and the bevel cutting unit cuts the steel pipe at a preset tilt angle. The relative installation positions of the guide wheel unit and the bevel cutting unit control the cutting depth of the bevel.

[0020] In practical applications, the steel pipe is placed on the rotating mechanism, and the oscillating unit drives the guide wheel unit to abut against the outer circumference of the steel pipe. The relative installation positions of the guide wheel unit and the beveling cutting unit are adjusted to control the beveling cutting depth. The rotating mechanism drives the steel pipe to rotate, and the beveling cutting unit performs beveling cutting operations on the rotating steel pipe at a preset tilt angle.

[0021] It can be seen that, compared with existing technologies, this pipe end beveling cutting device effectively controls the consistency of the distance between the cutting point and the pipe surface through the contact between the guide wheel unit and the outer circumference of the steel pipe, as well as the cooperation between the guide wheel unit and the beveling cutting unit. This overcomes the problems of inconsistent beveling dimensions and angle deviations caused by the large diameter of the turntable and the inability to maintain consistent distance between the cutting point and the pipe surface in existing large-diameter spiral submerged arc welded pipe end beveling processing technologies. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the overall structure of the pipe end beveling cutting device provided in this embodiment of the invention. Figure 1 ;

[0024] Figure 2 A schematic diagram of the overall structure of the pipe end beveling cutting device. Figure 2 ;

[0025] Figure 3 Schematic diagram of the walking cutting mechanism Figure 1 ;

[0026] Figure 4 Schematic diagram of the walking cutting mechanism Figure 2 ;

[0027] Figure 5Schematic diagram of the walking cutting mechanism Figure 3 ;

[0028] Figure 6 for Figure 5 Enlarged structural diagram of the CRRC body and the cutting assembly;

[0029] Figure 7 This is a schematic diagram of the cutting component.

[0030] icon:

[0031] 001. Steel pipe;

[0032] 100. Rotating mechanism; 110. Base; 120. Rotating roller;

[0033] 200. Walking and cutting mechanism; 210. Cutting assembly; 211. Swing unit; 2111. Fixed base; 2112. Connecting frame; 2113. First magnetic powder brake; 212. Guide wheel unit; 2121. Cutting wheel; 2122. First connecting rod; 2123. Second magnetic powder brake; 213. Bevel cutting unit; 2131. Plasma cutting gun; 2132. Second connecting rod; 2133. Rotary seat; 220. Walking assembly; 221. Sliding frame; 2211. Car body; 2212. V-shaped wheel; 2213. Flat wheel; 222. Slide rail; 2221. Guide rail base; 2222. V-shaped guide rail; 2223. Flat guide rail; 223. Power unit; 2231. Motor; 2232. Gear; 2233. Rack;

[0034] 300. Protective facilities. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0038] The existing technology for beveling the ends of large-diameter spiral submerged arc welded pipes has problems such as inconsistent bevel dimensions and skewed angles due to the large diameter of the turntable and the inability to maintain a consistent distance between the cutting point and the pipe surface.

[0039] In view of this, the present invention provides a pipe end beveling cutting device, comprising:

[0040] A rotating mechanism 100 and a traveling cutting mechanism 200 are provided. The rotating mechanism 100 drives the steel pipe 001 to rotate around its own axis. The traveling cutting mechanism 200 includes a cutting assembly 210, which includes a tilting unit 211, a guide wheel unit 212 mounted on the tilting unit 211, and a bevel cutting unit 213. The tilting unit 211 drives the guide wheel unit 212 to abut against the outer periphery of the steel pipe 001, and the bevel cutting unit 213 cuts the steel pipe 001 at a preset tilt angle. The relative installation positions of the guide wheel unit 212 and the bevel cutting unit 213 are used to control the cutting depth of the bevel.

[0041] In summary, the pipe end beveling cutting device provided by this invention can achieve the following technical effects:

[0042] This pipe end beveling cutting device effectively controls the consistency of the distance between the cutting point and the pipe surface through the contact between the guide wheel unit 212 and the outer periphery of the steel pipe 001, and the cooperation between the guide wheel unit 212 and the beveling cutting unit 213. It overcomes the problems of inconsistent beveling dimensions and angle deviations caused by the large diameter of the turntable and the inability to maintain consistent distance between the cutting point and the pipe surface in existing large-diameter spiral submerged arc welded pipe end beveling processing technology.

[0043] The following combination Figures 1 to 7 The structure and shape of the pipe end beveling cutting device provided in this embodiment are described in detail below:

[0044] Regarding how the distance between the cutting position and the end of steel pipe 001 is controlled, specifically:

[0045] like Figure 5 As shown, the traveling cutting mechanism 200 also includes a traveling assembly 220, which includes a sliding frame 221 and a slide rail 222. A tilting unit 211 is mounted on the sliding frame 221, which is slidably connected to the slide rail 222 along the axial direction of the steel pipe 001. The sliding of the sliding frame 221 along the slide rail 222 can drive the tilting unit 211, the guide wheel unit 212, and the bevel cutting unit 213 to move along the axial direction of the steel pipe 001 to adjust the distance between the cutting position and the end of the steel pipe 001.

[0046] Specifically, regarding how the sliding bracket 221 moves on the slide rail 222:

[0047] like Figure 5 and Figure 6 As shown, the sliding frame 221 includes a vehicle body 2211 and V-shaped wheels 2212. The slide rail 222 includes a guide rail base 2221 and a V-shaped guide rail 2222. The V-shaped wheels 2212 are rotatably connected to the vehicle body 2211, and the V-shaped guide rail 2222 is mounted on the guide rail base 2221. The V-shaped wheels 2212 roll on the V-shaped guide rail 2222. The mating of the V-shaped wheels 2212 and the V-shaped guide rail 2222 can limit the horizontal sliding of the vehicle body 2211 and the guide rail base 2221 in a direction perpendicular to the axis of the steel pipe 001.

[0048] In the solution of this embodiment, such as Figure 5 and Figure 6 As shown, the sliding frame 221 also includes a flat wheel 2213, which is rotatably connected to the vehicle body 2211. The slide rail 222 also includes a flat guide rail 2223, which is mounted on the guide rail base 2221. The flat wheel 2213 rolls on the flat guide rail 2223.

[0049] Specifically, regarding how the walking component 220 is driven:

[0050] The traveling assembly 220 also includes a power unit 223, which comprises a motor 2231, a gear 2232, and a rack 2233. The motor 2231 is mounted on the vehicle body 2211, the rack 2233 is mounted on the guide rail base 2221, and the gear 2232 is mounted on the motor 2231 and meshes with the rack 2233. The motor 2231 drives the gear 2232 to mesh with the rack 2233, thereby moving the vehicle body 2211 along the length of the guide rail base 2221.

[0051] Regarding the structural composition of the yaw unit 211, specifically:

[0052] like Figure 7 As shown, the oscillation unit 211 includes a fixed base 2111, a connecting frame 2112, and a first magnetic powder brake 2113. The fixed base 2111 is mounted on the sliding frame 221, and the connecting frame 2112 is hinged to the fixed base 2111 via the first magnetic powder brake 2113. The guide wheel unit 212 and the bevel cutting unit 213 are mounted on the connecting frame 2112. The oscillation of the connecting frame 2112 around the fixed base 2111 drives the guide wheel unit 212 and the bevel cutting unit 213 to move closer to the steel pipe 001. The sliding frame 221 has multiple support surfaces at different heights. The support surfaces are arranged in a stepped manner, with one of the support surfaces serving as the fixed surface. The fixed base 2111 is mounted on the fixed surface to accommodate steel pipe cutting operations of different sizes and specifications.

[0053] Regarding the structural composition of the guide wheel unit 212, specifically:

[0054] like Figure 7 As shown, the guide wheel unit 212 includes a cutter wheel 2121, a first connecting rod 2122, and a second magnetic powder brake 2123. One end of the first connecting rod 2122 is hinged to the connecting frame 2112 via the second magnetic powder brake 2123, and the other end is rotatably connected to the cutter wheel 2121. Driven by the oscillation unit 211, the cutter wheel 2121 abuts against the outer periphery of the steel pipe 001, effectively controlling the distance between the cutting point and the surface of the steel pipe 001 through direct contact.

[0055] Regarding how the cutting component 210 avoids the runout problem caused by the weld of steel pipe 001 during direct contact, specifically:

[0056] When the cutter wheel 2121 reaches the weld seam of steel pipe 001, the first magnetic powder brake 2113 switches to the de-energized braking state, and the second magnetic powder brake 2123 switches to the energized operating state. Relying on the braking effect of the first magnetic powder brake 2113, the cutter wheel 2121 is prevented from causing the connecting frame 2112 to jump at the moment it crosses the weld seam of steel pipe 001, which would cause the position of the cutting point from the pipe end to change and ultimately result in uneven bevel size.

[0057] Regarding the structural composition of the bevel cutting unit 213, specifically:

[0058] like Figure 7 As shown, the beveling unit 213 includes a plasma cutting gun 2131, a rotating base 2133, and a second connecting rod 2132. The plasma cutting gun 2131 is mounted on the rotating base 2133. The rotating base 2133 is hinged to the second connecting rod 2132. The second connecting rod 2132 is hinged to the connecting frame 2112. The hinge axis of the rotating base 2133 and the second connecting rod 2132 is perpendicular to the hinge axis of the second connecting rod 2132 and the connecting frame 2112.

[0059] In this embodiment, the rotating mechanism 100 includes a base 110 and two rotating rollers 120 rotatably connected to the base 110. The steel pipe 001 abuts against the rotating rollers 120. The rotation of the rotating rollers 120 drives the steel pipe 001 to rotate. Transmission is achieved through friction between the small-sized rotating rollers 120 and the outer circumference of the steel pipe 001, avoiding the precision deviations caused by using a large-sized turntable, and also providing wider adaptability to the processing specifications of the steel pipe 001.

[0060] In the solution of this embodiment, such as Figure 1 and Figure 2 As shown, the pipe end beveling cutting device also includes a protective mechanism 300, which is located on one side of the rotating mechanism 100 and has an arc-shaped guide surface. The pipe portion cut by the plasma cutting gun 2131 can fall smoothly along the arc-shaped guide surface of the protective mechanism 300.

[0061] In summary, the specific working process of the pipe end beveling cutting device provided in this embodiment is as follows:

[0062] The steel pipe 001 is placed on the rotating roller 120, and the fixing seat 2111 is installed on the support surface of the vehicle body 2211 at a suitable height. The drive motor 2231 drives the gear 2232 to rotate, and through meshing with the rack 2233, it drives the vehicle body 2211 to slide in the axial direction of the steel pipe 001, so as to adjust the distance between the cutting position and the end of the steel pipe 001.

[0063] Operators control the buttons for the first magnetic powder brake 2113 and the second magnetic powder brake 2123, causing the first magnetic powder brake 2113 to switch from a de-energized braking state to an energized operating state, and the second magnetic powder brake 2123 to switch from an energized operating state to a de-energized braking state (the de-energization control of the second magnetic powder brake 2123 should precede the energization control of the first magnetic powder brake 2113 by 1-2 seconds). This allows the alternating braking to place the cutter wheel 2121 onto the steel pipe 001 to be cut under operator intervention. Subsequently, the plasma cutting gun 2131 is adjusted via the second connecting rod 2132 and the rotating seat 2133, enabling the plasma cutting gun 2131 to cut. The distance between the cutting point and the pipe end, as well as the angle between the cutting point and the pipe end, both meet the requirements for pipe end beveling. Then, the rotating roller 120 is activated to rotate the steel pipe 001. After the steel pipe 001 rotates smoothly, the plasma cutting gun 2131 is operated to initiate the arc and perform pipe end beveling on the steel pipe 001. During the pipe end beveling process, the first magnetic powder brake 2113 is initially energized, while the second magnetic powder brake 2123 is de-energized. This causes the cutter wheel 2121 to drive the connecting frame 2112 to rotate around the fixed base 2111 according to the pipe shape change trajectory. This indirectly controls the relative position of the cutting point of the plasma cutting gun 2131 and the steel pipe 001 to remain unchanged. This control method ensures that the relative position of the cutting point of the plasma cutting gun 2131 and the steel pipe 001 remains constant. 121. Uniformity of beveling dimensions at the pipe end before the spiral weld stage; To prevent the connecting frame 2112 from jumping at the moment the cutter wheel 2121 crosses the weld of steel pipe 001, causing a change in the distance between the cutting point and the pipe end, and ultimately resulting in uneven beveling dimensions (i.e., abrupt change in the axial length of the beveling along steel pipe 001), the operator needs to operate the buttons controlling the first magnetic powder brake 2113 and the second magnetic powder brake 2123 again before the cutter wheel 2121 reaches the weld. This will change the first magnetic powder brake 2113 from the energized operating state to the de-energized braking state, and the second magnetic powder brake... When the actuator 2123 changes from the de-energized braking state to the energized operating state (the de-energization control of the first magnetic powder brake 2113 should precede the energization control of the second magnetic powder brake 2123 by 1-2 seconds), under this control mode, the connecting frame 2112 relies on the braking effect of the first magnetic powder brake 2113. In addition, the cutter wheel 2121 can rotate slightly around the first connecting rod 2122 at the moment of crossing the weld seam, so as to easily cross it without causing the cutting assembly 210 to shake. This ensures that the distance between the cutting point and the pipe end will not change instantaneously due to the cutter wheel 2121 crossing the weld seam, thus affecting the bevel cutting quality.

[0064] The tube portion cut off by the plasma cutting gun 2131 falls smoothly along the arc-shaped guide surface of the protective mechanism 300.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pipe end beveling cutting device, characterized in that... ,include: A rotating mechanism (100) and a walking cutting mechanism (200) are provided; the rotating mechanism (100) drives the steel pipe (001) to rotate around its own axis; the walking cutting mechanism (200) includes a cutting assembly (210), the cutting assembly (210) includes a sway unit (211), a guide wheel unit (212) installed on the sway unit (211) and a bevel cutting unit (213); the sway unit (211) drives the guide wheel unit (212) to abut against the outer periphery of the steel pipe (001), and the bevel cutting unit (213) cuts the steel pipe (001) at a preset angle; the relative position of the guide wheel unit (212) and the bevel cutting unit (213) controls the bevel cutting depth.

2. The pipe end beveling cutting device according to claim 1, characterized in that: The walking cutting mechanism (200) further includes a walking component (220), which includes a sliding frame (221) and a slide rail (222); the sway unit (211) is mounted on the sliding frame (221); the sliding frame (221) is slidably connected to the slide rail (222) along the axial direction of the steel pipe (001).

3. The pipe end beveling cutting device according to claim 2, characterized in that: The sliding frame (221) includes a vehicle body (2211) and a V-shaped wheel (2212); the slide rail (222) includes a guide rail base (2221) and a V-shaped guide rail (2222); the V-shaped wheel (2212) is rotatably connected to the vehicle body (2211), and the V-shaped guide rail (2222) is mounted on the guide rail base (2221); the V-shaped wheel (2212) rolls on the V-shaped guide rail (2222).

4. The pipe end beveling cutting device according to claim 3, characterized in that: The sliding frame (221) also includes a flat wheel (2213), which is rotatably connected to the vehicle body (2211); the slide rail (222) also includes a flat guide rail (2223), which is mounted on the guide rail base (2221); the flat wheel (2213) rolls on the flat guide rail (2223).

5. The pipe end beveling cutting device according to claim 3, characterized in that: The walking assembly (220) also includes a power unit (223), which includes a motor (2231), a gear (2232), and a rack (2233). The motor (2231) is mounted on the vehicle body (2211), the rack (2233) is mounted on the guide rail base (2221), and the gear (2232) is mounted on the motor (2231) and meshes with the rack (2233).

6. The pipe end beveling cutting device according to claim 2, characterized in that: The yaw unit (211) includes a fixed base (2111), a connecting frame (2112), and a first magnetic powder brake (2113); the fixed base (2111) is mounted on the sliding frame (221), and the connecting frame (2112) is hinged to the fixed base (2111) through the first magnetic powder brake (2113); the guide wheel unit (212) and the bevel cutting unit (213) are mounted on the connecting frame (2112).

7. The pipe end beveling cutting device according to claim 6, characterized in that: The sliding frame (221) is provided with multiple support surfaces of different heights; the support surfaces are arranged in a stepped manner, with one of the support surfaces serving as a fixed surface; the fixed seat (2111) is installed on the fixed surface.

8. The pipe end beveling cutting device according to claim 6, characterized in that: The guide wheel unit (212) includes a cutter wheel (2121), a first connecting rod (2122), and a second magnetic powder brake (2123); one end of the first connecting rod (2122) is hinged to the connecting frame (2112) through the second magnetic powder brake (2123), and the other end is rotatably connected to the cutter wheel (2121).

9. The pipe end beveling cutting device according to claim 6, characterized in that: The beveling unit (213) includes a plasma cutting gun (2131), a rotating base (2133), and a second connecting rod (2132); the plasma cutting gun (2131) is mounted on the rotating base (2133); the rotating base (2133) is hinged to the second connecting rod (2132); the second connecting rod (2132) is hinged to the connecting frame (2112); the hinge axis of the rotating base (2133) and the second connecting rod (2132) is perpendicular to the hinge axis of the second connecting rod (2132) and the connecting frame (2112).

10. The pipe end beveling cutting device according to claim 1, characterized in that: The rotating mechanism (100) includes a base (110) and two rotating rollers (120) rotatably connected to the base (110); the steel pipe (001) abuts against the rotating rollers (120); the rotation of the rotating rollers (120) is used to drive the steel pipe (001) to rotate.

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